Visualizing band structure hybridization and superlattice effects in twisted MoS<sub>2</sub>/WS<sub>2</sub> heterobilayers
نویسندگان
چکیده
Abstract A mismatch of atomic registries between single-layer transition metal dichalcogenides (TMDs) in a two-dimensional (2D) van der Waals heterostructure produces moiré superlattice with periodic potential, which can be fine-tuned by introducing twist angle the materials. This approach is promising both for controlling interactions TMDs and engineering their electronic band structures, yet direct observation changes to structure introduced varying has so far been missing. Here, we probe heterobilayers comprised MoS 2 WS angles ranging from ∘ 20 determine angle-dependent evolution using micro-focused angle-resolved photoemission spectroscopy. We find strong interlayer hybridization states at Γ ˉ -point Brillouin zone, leading shift valence maximum heterostructure. Replicas hybridized are observed center mini zones. confirm that these replica features arise inherent potential comparing our experimental observations density functional theory calculations dispersion. Our visualization underscores twisted heterobilayer semiconductors engineer hybrid superlattices alter optical properties 2D heterostructures wide range angles.
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ژورنال
عنوان ژورنال: 2D materials
سال: 2021
ISSN: ['2053-1583']
DOI: https://doi.org/10.1088/2053-1583/ac3feb